Article
Chemistry, Physical
Moon Jip Park, Sunam Jeon, SungBin Lee, Hee Chul Park, Youngkuk Kim
Summary: Higher-order topological insulator with topological corner states can be identified in twisted bilayer graphene systems through quantum oscillations. The tunneling of electrons between topological corner states leads to gate-tunable oscillations in the energy spectra, with oscillatory nodes indicating perfect suppression of tunneling and highlighting the topological nature of the corner states. A transport experiment is proposed for experimental realization of the oscillations, providing a feasible route to identify higher-order topological materials in twisted bilayer graphenes.
Article
Chemistry, Multidisciplinary
Hao-Ke Xu, Mingqiang Gu, Fucong Fei, Yi-Sheng Gu, Dang Liu, Qiao-Yan Yu, Sha-Sha Xue, Xu-Hui Ning, Bo Chen, Hangkai Xie, Zhen Zhu, Dandan Guan, Shiyong Wang, Yaoyi Li, Canhua Liu, Qihang Liu, Fengqi Song, Hao Zheng, Jinfeng Jia
Summary: Research has discovered that MnBi4Te7 is a topological insulator with quantum anomalous Hall effect and axion insulator phase. Through scanning tunneling spectroscopy, it has been observed that there is an electronic state at the edge of the magnetic MnBi2Te4 layer at 4.5 K, but not in the nonmagnetic Bi2Te3 layer. As the temperature increases, the edge state disappears, while the state induced by point defects persists.
Article
Chemistry, Multidisciplinary
Kajetan M. Fijalkowski, Nan Liu, Pankaj Mandal, Steffen Schreyeck, Karl Brunner, Charles Gould, Laurens W. Molenkamp
Summary: The recent emergence of topological states of matter has led to significant discoveries, including the quantum anomalous Hall effect, which has potential applications in quantum metrology and impacts fundamental research in topological and magnetic states, as well as axion electrodynamics. This study presents electronic transport studies on a (V,Bi,Sb)2Te3 ferromagnetic topological insulator nanostructure in the quantum anomalous Hall regime, allowing examination of individual ferromagnetic domains. The observed telegraph noise in the Hall signal is attributed to magnetization fluctuations of the domain, and analysis of temperature and external magnetic field effects provides evidence for quantum tunneling of magnetization in a macrospin state.
Article
Materials Science, Multidisciplinary
Chun-Xiao Liu, Michael Wimmer
Summary: This study investigates the electronic properties of a planar semiconductor-superconductor heterostructure with a thin ferromagnetic insulator layer acting as a spin filtering barrier. The results show that all three important induced physical quantities, Rashba spinorbit coupling, exchange coupling, and superconducting pairing potential, can be simultaneously enhanced for the hybrid mode through external gating. The stacked device geometry of this structure is shown to have specific advantages over conventional devices.
Article
Chemistry, Multidisciplinary
Shawulienu Kezilebieke, Viliam Vano, Md N. Huda, Markus Aapro, Somesh C. Ganguli, Peter Liljeroth, Jose L. Lado
Summary: By using moire patterns in van der Waals materials, we have successfully achieved a topological superconducting state. The magnetic moire pattern gives rise to Yu-Shiba-Rusinov minibands and periodic modulation of the Majorana edge modes.
Article
Physics, Condensed Matter
Chol-Jin Kang, Song-Il Kim, Chol-Song Yun, Chang-Il Kim
Summary: We explore the influence of magnetic field on the transport properties of FM/FI/s-wave SC junctions and FM/FM/s-wave SC junctions formed on the surfaces of 3DTIs. The magnetic field is applied perpendicular to the s-wave SC surfaces. The conductance is investigated for a broad range of magnetic field strength. Our findings show that the magnetoresistance depends on the magnitude of the magnetic field, and the results have potential applications in superconductor spintronics.
SOLID STATE COMMUNICATIONS
(2023)
Article
Physics, Applied
V. O. Yagovtsev, N. G. Pugach, M. Eschrig
Summary: The study investigates magnetization induced by the inverse proximity effect in a superconductor within hybrid bilayers containing a superconductor and a ferromagnetic insulator or a strongly spin-polarized ferromagnetic metal. It is conducted within a quasiclassical Green function framework, solving Usadel equations with appropriate boundary conditions for strongly spin-polarized ferromagnetic materials and presenting a comparison with recent experimental data. The study also explores the singlet to triplet conversion of superconducting correlations as a result of the proximity effect with a ferromagnet.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Hamed Vakil, Samiran Ganguly, George J. de Coster, Mahesh R. Neupane, Avik W. Ghosh
Summary: The surface state of a 3D topological insulator can be used for spin-orbit torque based switching, while the magnetization of a ferromagnet can control the surface current. By exploiting this reciprocal behavior, a 1-transistor 1-magnetic tunnel junction random access memory unit can be designed for ultra low power Processing-in-Memory architecture.
Article
Nanoscience & Nanotechnology
Saumen Acharjee, Umananda Dev Goswami
Summary: The study reveals the presence of anomalous Andreev bound states, Majorana mode, and Josephson supercurrent in the structure of clean noncentrosymmetric superconductor/half-metal/noncentrosymmetric superconductor under specific conditions, which can be controlled by the ratio of magnetic moments.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Somesh Chandra Ganguli, Viliam Vano, Shawulienu Kezilebieke, Jose L. Lado, Peter Liljeroth
Summary: Transition metal dichalcogenides (TMDC) are a family of two-dimensional materials with diverse quantum states. NbSe2, a d(3) TMDC, is a superconducting material with strong electronic repulsions indicating the presence of competing interactions and correlated insulating states.
Article
Chemistry, Multidisciplinary
Shu Hsuan Su, Pei-Yu Chuang, Hsin-Yu Chen, Shih-Chang Weng, Wei-Chuan Chen, Ku-Ding Tsuei, Chao-Kuei Lee, Shih-Hsun Yu, Mitch M-C Chou, Li-Wei Tu, Horng-Tay Jeng, Chien-Ming Tu, Chih-Wei Luo, Cheng-Maw Cheng, Tay-Rong Chang, Jung-Chun Andrew Huang
Summary: The study demonstrates the topological proximity effect between antimonene and Sb2Te3, indicating the 2D material antimonene possesses a 2D topological state and forms Dirac fermions at the interface of a 2D normal insulator and a 3D topological insulator. By hydrogen etching Sb2Te3, the position of the Dirac point and shape of the Dirac surface state can be tuned, providing a new approach to create QSH systems in 2D-material TI heterostructures.
Review
Physics, Multidisciplinary
Jiahao Fan, Huaqing Huang
Summary: This review summarizes the recent progress of topological states in quasicrystals, with a focus on one-dimensional and two-dimensional systems. In one-dimensional quasicrystals, the topological nature is attributed to the quasiperiodic order. In two-dimensional quasicrystals, real-space expressions are introduced to describe topological invariants due to the lack of translational symmetry. The unique quasicrystalline symmetry-protected topological states without crystalline counterpart are also discussed.
FRONTIERS OF PHYSICS
(2022)
Article
Physics, Multidisciplinary
Chang Liu, YunYi Zang, Yan Gong, Ke He, XuCun Ma, QiKun Xue, YaYu Wang
Summary: In this study, we investigated the anomalous Hall effect in magnetically doped topological insulators with Mn and Cr doping. We found that the Mn-type effect is strengthened by reducing the film thickness, while the Cr-type effect shows the opposite trend. We provided a phenomenological physical picture to explain the evolution of magnetic order and anomalous Hall chirality in magnetically doped topological insulators.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2022)
Article
Chemistry, Analytical
Aek Jantayod
Summary: In this study, the theoretical characteristics of a ferromagnetic/insulator/ferromagnetic Rashba metal junction with both Rashba spin-orbit coupling and exchange energy splitting were investigated. Three metallic states were found in the ferromagnetic Rashba metal, and the conductance of the junction was strongly influenced by the thickness and barrier height of the insulator layer in the Rashba ring metal and anomalous Rashba metal states. Additionally, the spin polarization in the anomalous Rashba metal state was high and unaffected by the qualities of the insulator.
Article
Materials Science, Multidisciplinary
Debashish Mondal, Arnob Kumar Ghosh, Tanay Nag, Arijit Saha
Summary: We theoretically investigate a practically realizable Floquet topological superconductor model based on a one-dimensional Rashba nanowire, which can generate multiple MEMs, and demonstrate the robustness of these MEMs in the presence of on-site time-independent random disorder potential.
Article
Nanoscience & Nanotechnology
Spyridon G. Kosionis, Emmanuel Paspalakis
Summary: In this study, we theoretically investigate the pump-probe response and the four-wave mixing spectrum in a hybrid system composed of a semiconductor quantum dot and a spherical metal nanoparticle. Using a density matrix methodology, we calculate the absorption/gain, dispersion, and four-wave mixing spectra, and analyze their spectral characteristics. We also apply the metastate theory and the dressed-state picture to predict the positions of the spectral resonances.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
L. S. Lima
Summary: This study investigates quantum correlation and entanglement in the non-Hermitian Hubbard model. By analyzing quantum entanglement measures such as entanglement negativity and entropy, the effect of non-Hermitian imaginary hopping on the system is explored. It is found that in the large... limit, the non-Hermiticity reverses the behavior of the ground state energy and low-lying excitations.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Nam-Chol Ri, Chung-Sim Kim, Sang-Ryol Ri, Su-Il Ri
Summary: By decreasing the lattice thermal conductivity of GNR through chemical derivation and strain, enhancing the thermoelectric properties of the electron part can be an important method to approach PGEC. This paper proposes synthesized hybrid systems formed by chemical derivation in the middle parts of b-AGNRs, and investigates the band structures and thermoelectric properties of the electron part under different strains. The results show that the band gaps of the systems significantly increase under different strains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Le T. T. Phuong, Tran Cong Phong
Summary: This study investigates the effects of gas molecules adsorbed on /312-borophene on its electronic heat capacity and thermal Schottky anomaly. The results show that the adsorbed gas molecules have different impacts on the electronic heat capacity, leading to the generation of various new energy levels.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Tianyan Jiang, Jie Fang, Wentao Zhang, Maoqiang Bi, Xi Chen, Junsheng Chen
Summary: This paper investigates the adsorption and sensing properties of transition metal-doped WSSe gas-sensitive devices towards H2, CO, and CO2 gases related to thermal runaway in Li-ion batteries using density functional theory. The results show that Ti, Mn, and Mo dopants preferentially bind to the S-surface of the WSSe monolayer, and all three monolayers exhibit significantly improved sensing characteristics, with chemisorption towards CO. Band structure analysis suggests that the Ti-WSSe monolayer has the potential to be used as a resistive CO detection sensor. Recovery time calculations indicate the reuse capabilities of the gas-sensitive devices. Mn-WSSe monolayer shows potential for H2 detection, while Mo-WSSe monolayer is more suitable for CO2 detection. This work lays the foundation for potential gas-sensitive applications of WSSe monolayer in thermal runaway scenarios, advancing research in gas sensing domains.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Olga A. Alekseeva, Aleksandr A. Naberezhnov, Ekaterina Yu. Koroleva, Aleksandr Fokin
Summary: This study investigates the temperature dependence of crystal structure and dielectric response in a nanocomposite material containing porous glasses and embedded sodium nitrate. The results reveal a crossover point in the temperature dependence of the order parameter of the structural transition in sodium nitrate nanoparticles, as well as a decrease in activation energy of sodium ions hopping conductivity during heating.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Lijun Cheng, Fang Cheng
Summary: This paper investigates the effects of electric and magnetic fields on the Goos-Hanchen (GH) shift in a semi-Dirac system. The results show that the magnitude and direction of the GH shift depend on various factors such as incidence angle, electric barrier height and width, and magnetic field. It is observed that there is a saltus step in GH shifts at the critical magnetic field, which decreases with increased potential barrier thickness. Additionally, the GH shift can be significantly enhanced by applying an electric field in the III region. These findings are important for the development of semi-Dirac based electronic devices.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Alexander K. Fedotov, Uladzislaw E. Gumiennik, Julia A. Fedotova, Janusz Przewoznik, Czeslaw Kapusta
Summary: The study conducted an improved analysis of carrier transport in single-layer graphene and hybrid structures, showing the coexistence of negative and positive contributions in magnetoresistive effect. Various models were used to analyze the dependences on temperature and magnetic field, providing insights into the behavior of electrical resistance in the structures.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xuhui Peng, Tao Chen, Ruotong Chen, Shizheng Chen, Qing Zhao, Xiaoping Huang
Summary: In this study, a novel method was proposed to design and fabricate optoelectronic devices with highly precise controlled photorefractive liquid crystal structures. By utilizing quantum dots and electric tuning, a regular periodic grating was formed in a quantum dot-doped liquid crystal volume illuminated by a laser standing evanescent wave field. The obtained optical diffraction pattern showed equally spaced light spots and high diffraction efficiency, indicating a significant change in the refractive index of the nanostructured device.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Kai-Hua Yang, Xiao-Hui Liang, Huai-Yu Wang, Yi-Fan Wu, Qian-Qian Yang
Summary: In this work, a theoretical model is proposed to achieve the controllability of quantum interference and decoherence. The effects of intralead Coulomb interaction, interdot tunneling, and electron-phonon interactions on differential conductance are investigated. The results show the appearance of destructive interference, Fano interference, and negative differential conductance in strong dot-lead tunneling regions, while a characteristic pattern of positive and negative differential conductances appears in the weak dot-lead tunneling regime.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Xueying Wang, Qian Ma, Qi Zhang, Yi Wang, Lingyu Li, Dongheng Zhao, Zhiqiang Liu
Summary: Porous double-channel alpha-Fe2O3/SnO2 heterostructures with tunable surface/interface transport mechanism were successfully fabricated by electrospinning and calcination. These heterostructures exhibited a large specific surface area, providing more active sites and enhanced adsorption capacity. The optimal composite materials showed the highest response value and the fastest response/recovery times to DMF, along with good cycling performance, long-term stability, and high gas selectivity.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Donglin Guo, Zhengmeng Xu, Chunhong Li, Kejian Li, Bin Shao, Xianfu Luo, Jianchun Sun, Yilong Ma
Summary: Using full electron-phonon interactions and the Boltzmann transport equation, this study investigates the phonon scattering channel and electrical properties of graphene under anharmonic phonon renormalization (APRN). The results show that the APRN reduces the phonon frequency and three-phonon phase space with increasing temperature, affecting the acoustic branch more than the optical branch. The thermal conductivity of graphene decreases after considering three- and four-phonon scattering, and the primary scattering channels are identified. Furthermore, the APRN increases the strength of electron-phonon coupling and leads to an increase in n-type electric resistance at room temperature.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Hongping Zhao, Man Zhao, Dayong Jiang
Summary: The study proposes a broadband photodetector with high response, high sensitivity, and controllable band by integrating quantum dots and highly conductive materials. The PD composed of ZnO film/PbS quantum dots heterostructure shows excellent photoresponse performance in the UV-Vis-NIR range, with the peak responsivity increased by 550%, accompanied by significant red shift, faster response, and recovery speed. By using RF magnetron sputtering to prepare ultra-thin ZnO film, the impact of PbS quantum dots on the photoelectric properties of ZnO film is comprehensively and systematically discussed.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Ye Xuan Meng, Liwei Jiang, Yisong Zheng
Summary: Manipulating magnetism by electrical means is an effective method for realizing ultra-low power spintronic-integrated circuits. In this study, it is demonstrated that the two-dimensional semiconductor material InO monolayer can be tuned to a half-metallic state by applying a gate voltage, providing theoretical guidance for adjusting two-dimensional magnetic semiconductors.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)
Article
Nanoscience & Nanotechnology
Anusha Kachu, Aalu Boda
Summary: In this research, we investigated the impact of confinement nature on a neutral hydrogenic donor impurity in a quantum dot. The study demonstrated intriguing behavior in response to changes in potential shape, quantum dot parameters, and spin-orbit coupling strengths. The findings provide valuable insights into the fundamental physics of quantum dots and impurities and can aid in the design and optimization of QD-based technologies.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2024)